Civil Engineering - RCC Structures Design - Discussion
Discussion Forum : RCC Structures Design - Section 5 (Q.No. 11)
11.
The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm2 respectively. If m = 15, the depth of its neutral axis is
Discussion:
18 comments Page 1 of 2.
Sridhar said:
1 year ago
The Stress developed in steel is wrong at 250 kg/cm^2 instead of 1250 kg/cm^2.
put stress of steel = 1250 kg/cm^2.
the answer became 29 cm which is equal to 30 cm.
Stress in steel = 1250/15 = 83.33 kg/cm^2.
Now
62.5/x = 83.33/70-x.
x = 29 cm
= 30 cm.
put stress of steel = 1250 kg/cm^2.
the answer became 29 cm which is equal to 30 cm.
Stress in steel = 1250/15 = 83.33 kg/cm^2.
Now
62.5/x = 83.33/70-x.
x = 29 cm
= 30 cm.
Mohsan Chhajro said:
3 years ago
By using formula mc/ (mc+t) = n/ (d-n).
And putting respective values answer comes out to be equal to 30.9 cm.
And putting respective values answer comes out to be equal to 30.9 cm.
(1)
Krishan Kumar said:
5 years ago
Yes, 55.26 is the right answer.
(4)
Fero said:
5 years ago
(1/(1+(280/3*steel stress)))*d.
N.A depth only depends on steel.
Or
k*d.
For fe250 k=0.4.
So N.A depth =0.4*70= 28cm= 30cm.
N.A depth only depends on steel.
Or
k*d.
For fe250 k=0.4.
So N.A depth =0.4*70= 28cm= 30cm.
(2)
Anji said:
7 years ago
What type of stresses developed in concrete and steel?
(1)
Shubham sharma said:
7 years ago
In question stress in steel is given 250 this is wrong.
Take it as 1250. Then it comes 30.
Take it as 1250. Then it comes 30.
Sikander said:
7 years ago
Mc ÷(Mc+s)
15*62.5÷ (15*62.5+1400).
=28.07 approx 30.
Here, 2500kg/cm2 steel stress so as IS 1400kg/cm2 is permissible stress.
15*62.5÷ (15*62.5+1400).
=28.07 approx 30.
Here, 2500kg/cm2 steel stress so as IS 1400kg/cm2 is permissible stress.
(2)
Robi said:
7 years ago
Take permissible stress 140, not 250 so the answer will come 30.
Ajay said:
7 years ago
55.26 cm is correct I think.
(2)
Vikas Kumar said:
8 years ago
Correct Answer = 55.26 CM.
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